Item specifics
Description
The STM32F334K8T6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an LQFP-32 package, purpose-built for digital power and advanced lighting control. It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 12 KB SRAM, CAN 2.0B, HRTIM (217ps, 10 channels), two 12-bit ADCs (9ch, 0.2µs), three 12-bit DACs, three ultra-fast comparators (25ns), one programmable op-amp (PGA), up to 12 timers (incl. 1 motor control PWM/deadtime), and up to 11 communication interfaces (3×USART/2×SPI/2×I2C/CAN). 25 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Core specs are identical to the STM32F334C8T6 (LQFP-48, 37 I/Os), but in a smaller package, making it ideal for space-constrained applications requiring high-precision PWM and CAN communication.
Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 12 KB SRAM CAN 2.0B: Industrial bus interface HRTIM: 10-channel high-resolution timer, 217ps resolution, supports complex PWM and phase control 2×12-bit ADCs: 9 channels, 0.2 µs, 0–3.6 V 3×12-bit DACs: Buffered output 3 Ultra-Fast Comparators: 25 ns 1 Programmable Op-Amp (PGA): Gain ×2/×4/×8/×16 Timers: 1× motor control PWM (deadtime/emergency stop), 2× 16-bit GP, 1× 32-bit GP, 2× watchdogs, SysTick + HRTIM Communication Interfaces: 3×USART (ISO7816/LIN/IrDA), 2×SPI, 2×I2C (SMBus), CAN 2.0B I/Os: 25, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: LQFP-32 (7×7 mm)
Digital Power: SMPS, inverters, PFC, digital PFC, LLC resonant converters Advanced Lighting: LED dimming, RGB strips, HID ballasts Motor Control: BLDC/PMSM FOC, fans, pumps (motor control PWM) Industrial Automation: CAN bus nodes Consumer: Inverter-driven home appliances (air conditioners, washing machines)
HRTIM High-Resolution Timer: 217ps resolution, 10 channels, supports complex topologies and precise timing, optimized for digital power Cortex-M4 + FPU + Analog Peripherals: High integration for digital power and lighting control LQFP-32 Compact Package: 25 I/Os, retains HRTIM and CAN, ideal for space-constrained designs 3 DACs + 3 Comparators + 1 PGA: Rich analog signal chain, no external op-amps/comparators needed, saves BOM CAN 2.0B: Industrial communication support 72 MHz FPU: Single-cycle DSP and floating-point operations ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL with dedicated digital power libraries
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FAQ:
What is the STM32F334K8T6 and how does it differ from the STM32F334R8T6?
The STM32F334K8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash, 12 KB SRAM, and the same High‑Resolution Timer (HRTIM), integrated op‑amps, and fast comparators as the rest of the F334 family. The key difference is the package: it uses an LQFP‑32 with up to 25 I/Os, while the R8T6 uses an LQFP‑64 with up to 51 I/Os. All core analog and digital features are identical, but the number of externally available HRTIM channels, ADC inputs, and GPIOs is reduced. Choose the K8T6 when board space is extremely limited and you only need a few high‑resolution PWM outputs and sensor signals.
Can I build a complete digital power supply with only 32 pins?
Absolutely. The HRTIM can still drive a buck, boost, or half‑bridge converter with just 2–4 PWM channels, all of which can be routed on the K8T6. The built‑in op‑amps and comparators handle current and voltage sensing without external amplifiers, further saving pins. With careful planning in STM32CubeMX, you can fit a full digital control loop—feedback, PWM generation, and communication—into the tiny LQFP‑32 footprint.
How many HRTIM outputs and analog channels can I actually use on the K8T6?
Although the HRTIM module supports up to 10 PWM outputs, the 32‑pin package limits you to approximately 5–7 HRTIM signals, depending on your other peripheral needs. Both embedded op‑amps and all three comparators remain fully usable. The two 12‑bit ADCs and two DACs are available, but the number of external ADC input channels is reduced. Use STM32CubeMX to verify your exact pin‑out.
Is 64 KB Flash and 12 KB SRAM sufficient for a real‑time control application on such a small device?
Yes. Digital power control algorithms (e.g., a 2‑pole‑2‑zero compensator or sensorless FOC core) are compact and easily fit in 64 KB of Flash. The 12 KB SRAM includes 4 KB of zero‑wait‑state CCM‑SRAM for critical variables, while the FPU and DSP instructions keep the control loop fast and deterministic. This memory is more than enough for dedicated power converters and lighting controllers.
How does the STM32F334K8T6 compare to the STM32F303K8T6? When should I pick the F334?
Both share the same 72 MHz Cortex‑M4F core, 64 KB Flash, and LQFP‑32 package. The F334K8T6 replaces the F303’s fast 12‑bit ADCs and CAN interface with the HRTIM, integrated op‑amps, and ultra‑fast comparators. Choose the F334 when your primary need is high‑resolution PWM for digital power, lighting, or inverters. Pick the F303 if you require CAN communication or a larger number of fast ADC channels.
Can the built‑in op‑amps and comparators on the K8T6 replace external current‑sensing circuitry?
Yes. The two embedded operational amplifiers can be configured as PGAs with gain up to 32, directly interfacing with shunt resistors for current measurement. The three ultra‑fast analog comparators provide cycle‑by‑cycle over‑current protection. This integrated analog front‑end significantly reduces the BOM and PCB area, which is especially valuable in the tiny 32‑pin form factor.
Does the STM32F334K8T6 have a CAN or USB interface?
No. The F334K8T6, like all F334 devices, lacks a CAN controller and USB peripheral. Its communication interfaces are limited to 3× USART, 2× SPI, and 2× I2C. If your design requires CAN or USB, the pin‑compatible STM32F303K8T6 adds those peripherals, but you will lose the HRTIM and the analog front‑end.
Can I upgrade from an STM32F103C8T6 to the STM32F334K8T6 for power control applications?
Yes, this is a very common migration. Moving from a Cortex‑M3 with basic PWM to the F334K8T6 gives you the HRTIM with 217 ps resolution, an FPU, DSP instructions, integrated op‑amps, and fast comparators. The control loop performance and efficiency gains are dramatic, though you will need to adapt your code to take advantage of the new peripherals. The LQFP‑32 package is often similar in size, allowing a compact replacement.
What development tools and libraries support the HRTIM on the STM32F334K8T6?
The HRTIM is fully supported in STM32CubeMX, where you can graphically configure the timer channels, link them to ADCs and DACs, and set dead‑times or phase shifts. ST also provides the X‑CUBE‑DPOWER digital‑power software pack with ready‑to‑use libraries for buck, boost, and LLC converters. All major IDEs (STM32CubeIDE, Keil, IAR) support the chip.
What are the most typical applications for the STM32F334K8T6?
It is ideal for ultra‑compact digital power modules, miniature LED drivers, solar micro‑inverters, wireless charging transmitters, induction heating, and any space‑constrained design that requires high‑resolution PWM generation combined with precise analog sensing. Its small footprint and low cost make it popular in high‑volume, function‑dedicated power products.